如何在listview中顯示數據？

Question

節電器是Button。當我點擊它時，我想從EditText獲取數據，將它發送到另一個Activity並顯示在ListView;但它沒有顯示，我不知道該怎麼辦。

在mainActivity

if (v == saver) { 
    String textData = reminder.getText().toString(); 

    Intent intent3 = new Intent(CreateActivity.this, ViewActivity.class); 
    intent3.putExtra(textData, "key1"); 
    startActivity(intent3); 
} 

在列表活動

ListView list; 
ArrayList<String> taskslist; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_view); 
    list = (ListView) findViewById(R.id.listView1); 
    taskslist = new ArrayList<String>(); 
    final ArrayAdapter<String> adapter = new ArrayAdapter(this, 
      android.R.layout.simple_list_item_1, taskslist); 

    list.setAdapter(adapter); 
    try { 
     String recivedData; 

     Intent intentt; 
     intentt = getIntent(); 

     recivedData = intentt.getExtras().getString("key1"); 
     taskslist = intentt.getStringArrayListExtra(recivedData); 

    } catch (Exception e) { 
     // TODO: handle exception 
    } 
    // adapter.notifyDataSetChanged(); 
} 

Answer 1

您應該更新您的數據集，然後調用notifyDataSetChanged更新您的列表，或設置adapter

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_view); 
    list = (ListView) findViewById(R.id.listView1); 
    taskslist = new ArrayList<String>(); 
    taskslist = getIntent().getString("key1").getStringArrayListExtra(recivedData); 
    final ArrayAdapter<String> adapter = new ArrayAdapter(this, 
      android.R.layout.simple_list_item_1, taskslist); 

    list.setAdapter(adapter); 

} 

或

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_view); 
    list = (ListView) findViewById(R.id.listView1); 
    taskslist = new ArrayList<String>(); 
    final ArrayAdapter<String> adapter = new ArrayAdapter(this, 
      android.R.layout.simple_list_item_1, taskslist); 

    list.setAdapter(adapter); 
    try { 
     String recivedData; 

     Intent intentt; 
     intentt = getIntent(); 

     recivedData = intentt.getExtras().getString("key1"); 
     taskslist = intentt.getStringArrayListExtra(recivedData); 

    } catch (Exception e) { 
     // TODO: handle exception 
    } 
    adapter.setData(tasklist); // update data set 
    adapter.notifyDataSetChanged(); 
} 

Answer 2

代替：

taskslist = intentt.getStringArrayListExtra(recivedData); 

嘗試增加以taskslist並通知適配器：

taskslist.addAll(intentt.getStringArrayListExtra(recivedData)); 
adapter.notifyDataSetChanged();